Hi Am I correct in seeing 4 cats on this "H" pipe? what can I do to increase the performance and reduce the backflow on this car it is all original and bone stock with 120K miles on it and it sounds like a V6 wit resonators! I would like it to be a little more aggresive sounding any help would be appriciated. We also want to keep using the stock mufflers and tailpipes so I guess I'm looking for a "bolt on" remedy
Thanks.

Last edited by jjlock59; 08-12-2009 at 08:55.
Reason: misspelled words

The cats don't create that much back pressure or quiet the car down like people think. If you disconnect it after the h-pipe and start it- you will see what I mean.

Even though you want to keep the stock mufflers, I would recommend swapping out the mufflers for something a little more aggressive sounding.

I swapped to 2.5 MAC and they sound awesome when you mash it to the floor- but have an annoying sound at 2,000 RPM. I have a vert with a 3.73 rear gears- so 2,000 RPM is 65mph on the highway. Drives me crazy with the top down. I am trying to go backwards a little as I want a sleeper since the car is supercharged built up block putting out over 400hp. I only recommend MAC s-tube mufflers if you like it LOUD.

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